The basis of this circuit is the HA2400 released at the time. The circuit is from a Radio Electronics magazine from March 1980. The power supply must be symmetrical at 15 V.
This circuit was found in a 90s Popular Electronics. The sensor can be any phototransistor. ...
This circuit is valid for other comparators of the same series. In this case, a lamp is excited, but...
This circuit was found in RCA and General Electric documentation from the 1980s. The circuit has...